Rodolfo Alonso Hernandez 92a4db01fe [OVN][FT] Mech driver stop accessing DB at exit
"OVNMechanismDriver._clean_hash_ring" is called at exit. Because the
SQL connection is already closed, an exception is logged. This patch
mocks this method and avoids the OVN FTs to log this message.

Closes-Bug: #1919352

Change-Id: I6c68d15d0af644ab00467bea8e0cd3ca816f5cc5
2021-03-18 10:17:56 +00:00
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